Figure 2.

Working principle of the PSP buffers: (A) a MC packet is received, carrying an incoming spike. It triggers a DMA transfer. (B) As a result, the DMA Done event is triggered when the synaptic data associated with the spike is retrieved from SDRAM. (C) Synapses related to this spike are processed and their contributions are stored in the PSP buffers of the targeted neurons in the cell of the buffer corresponding to the synaptic delays. (D) When the next Timer Event is issued, the update process reads the contributions of previously received spikes for the current timestep and adds them to the neurons' membrane potential after updating its value (according to the used neural model).